ISO/FDIS 22752

Railway applications -- Bodyside windows for rolling stock

Applications ferroviaires -- Fenêtres latérales pour le matériel roulant

General Information

• Status: Published
• ICS: 45.060.01 - Railway rolling stock in general
• Technical Committee: ISO/TC 269/SC 2 - Rolling stock
• Drafting Committee: ISO/TC 269/SC 2/WG 3 - Body side glazing for railway rolling stock
• Current Stage: 5020 - FDIS ballot initiated: 2 months. Proof sent to secretariat
• Start Date: 01-Jul-2021
• Completion Date: 01-Jul-2021

Standards Content (sample)

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 22752
ISO/TC 269/SC 2
Railway applications — Bodyside
Secretariat: AFNOR
windows for rolling stock
Voting begins on:
2021­07­01
Applications ferroviaires — Fenêtres latérales pour le matériel
roulant
Voting terminates on:
2021­08­26
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/FDIS 22752:2021(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN­
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. ISO 2021
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ISO/FDIS 22752:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

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Published in Switzerland
ii © ISO 2021 – All rights reserved
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ISO/FDIS 22752:2021(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Technical and test requirements ......................................................................................................................................................... 4

4.1 General ........................................................................................................................................................................................................... 4

4.2 Safety ............................................................................................................................................................................................................... 6

4.2.1 General...................................................................................................................................................................................... 6

4.2.2 Static strength of window ........................................................................................................................................ 6

4.2.3 Aerodynamic fatigue loading ................................................................................................................................ 6

4.2.4 External impact performance ............................................................................................................................... 9

4.2.5 Shock resistance ............................................................................................................................................................10

4.2.6 Fragmentation for tempered glass ................................................................................................................11

4.2.7 Internal soft body impact resistance ...........................................................................................................13

4.2.8 Emergency function ...................................................................................................................................................14

4.2.9 Guidance on the application of adhesive films ....................................................................................15

4.3 Quality .........................................................................................................................................................................................................16

4.3.1 Appearance defects.....................................................................................................................................................16

4.3.2 Durability (weather-resistance) ......................................................................................................................20

4.3.3 Adhesive bonding .........................................................................................................................................................20

4.4 Function .....................................................................................................................................................................................................21

4.4.1 Water tightness ..............................................................................................................................................................21

4.4.2 Durability test for movable windows ..........................................................................................................23

4.4.3 Optical distortion ...................................................................... ....................................................................................23

4.4.4 Dew point ............................................................................................................................................................................24

5 Marking .......................................................................................................................................................................................................................24

Annex A (normative) Values for the aerodynamic fatigue loading test .........................................................................25

Annex B (normative) Test method of external impact performance (small particles from track) ..27

Annex C (normative) Test method of external impact performance (small missiles) ...................................30

Annex D (normative) Passenger containment test .............................................................................................................................32

Annex E (informative) Alternative visual inspection procedure with a luminous board ...........................34

Annex F (normative) Procedure for durability of edge seal by climatic test ...........................................................36

Annex G (normative) Slanted projection line test ...............................................................................................................................39

Bibliography .............................................................................................................................................................................................................................43

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ISO/FDIS 22752:2021(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non­governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT),see www .iso .org/

iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 269, Railway applications, Subcommittee

SC 2, Rolling stock.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2021 – All rights reserved
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FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 22752:2021(E)
Railway applications — Bodyside windows for rolling stock
1 Scope

This document defines the classification, technical requirements, and markings for the following

bodyside windows:
a) standard windows:
1) standard fixed windows;
2) standard movable windows;
b) emergency windows:
1) emergency escape windows;
2) emergency access windows.

NOTE In certain situations, emergency escape windows and emergency access windows are the same

window.

This document applies to bodyside windows constructed from glazing materials only.

This document sets out requirements that apply to the glazing with its associated mounting

arrangement.

This document applies to all windows mounted to the side of all types of railway vehicles, including

heavy and urban rail vehicles. This includes windows mounted on the side of saloons, restaurant/buffet

cars, vestibules, toilets, driving cabs, crew compartments and technical rooms.
This document does not apply to on-track machines.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 3917:2016, Road vehicles — Safety glazing materials — Test methods for resistance to radiation, high

temperature, humidity, fire and simulated weathering

ISO 7892:1988, Vertical building elements — Impact resistance tests — Impact bodies and general test

procedures
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
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ISO/FDIS 22752:2021(E)
3.1
bodyside window

glazing unit (3.3) or window unit (3.2), with its mounting arrangement, fitted to the side of a vehicle,

including the cab

Note 1 to entry: Mounting arrangements can include frames, rubber gaskets, adhesives, etc.

Note 2 to entry: Some types of windows do not have frames. In this case, the glazing unit and the window unit are

the same concept.
3.2
window unit

assembly of a glazing unit (3.3) with a set of frames for mounting to the car body shell

3.3
glazing unit

assembly of one or more sheets of glazing material (3.4), including any interlayer, edge seal (3.10), or

space bar
Note 1 to entry: An example of a glazing unit is given in Figure 1.
Key
A exterior of the vehicle
B interior of the vehicle
1 outer glazing material
2 inner glazing material
3 cavity (3.9) (if any)
4 spacer bar (if any)
5 edge seal (3.10) (if any)
Figure 1 — Example of glazing unit
3.4
glazing material
material that allows the transmittance of light
3.5
tempered glass
toughened glass

glazing material (3.4) consisting of a single layer of glass which has been subjected to special thermal

treatment to increase its mechanical strength and to condition its fragmentation after shatter

Note 1 to entry: Semi-tempered glass is not considered as tempered glass or toughened glass in this document.

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ISO/FDIS 22752:2021(E)

[SOURCE: ISO 3536:2016, 2.2, modified — The term "toughened safety glass" has been replaced by the

terms "tempered glass" and "toughened glass"; in the definition, "or chemical" has been deleted before

treatment; Note 1 to entry has been added.]
3.6
laminated glass

assembly consisting of one sheet of glass with one or more sheets of glass and/or plastic glazing sheet

material joined together with one or more interlayers

Note 1 to entry: The interlayer holds together when the laminated glass is shattered.

[SOURCE: ISO 12543-1:2011, 2.1, modified —Note 1 to entry has been added.]
3.7
insulating glazing

glazing unit (3.3) assembled such that the cavity(ies) (3.9) are maintained in a permanent state of

dehydration
3.8
spacer system

mechanical system between glazing materials (3.4) to create the cavity (3.9) for insulating glazing (3.7)

3.9
cavity
space between two sheets of glazing material (3.4) in insulating glazing (3.7)
3.10
edge seal

hermetic sealing at the periphery of two glass sheets of insulating glazing (3.7) to maintain the gas

between them

Note 1 to entry: The terms “weld” and “welding” can be used instead of “seal” and “sealing” respectively,

dependent upon the processing method.

[SOURCE: ISO 19916-1:2018, 3.3, modified — In the definition, "of insulated glazing" was added and the

word “vacuum” has been changed to “the gas”.]
3.11
dew point

temperature at which dew or frost first occurs in the cavity (3.9) of insulating glazing (3.7)

3.12
poly organics glass

glazing material (3.4) made of transparent plastics such as polycarbonate and polymethyl methacrylate

3.13
display window

glazing unit (3.3) or window unit (3.2) with its mounting arrangement which is mounted to the side of

the vehicle, through which persons outside the train can receive visual information

3.14
movable window

glazing unit (3.3) or window unit (3.2) with its mounting arrangement which can be opened

3.15
peripheral area
area bounded within 150 mm of all edges of a glazing unit (3.3)

Note 1 to entry: If an area obscured by internal panels is more than 150 mm from the edge of the glass, then the

entire obscured area is considered as a peripheral area.
Note 2 to entry: See Figure 2.
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ISO/FDIS 22752:2021(E)
3.16
primary area
area of a glazing unit (3.3) which passengers and staff can look through

Note 1 to entry: The primary area of a glazing unit is the area bounded within the peripheral area. In case of non­

transparent windows, the primary area is not applicable.
Dimensions in millimetres
Key
1 primary area (3.16)
2 peripheral area (3.15)
3 edge of glass
Figure 2 — Primary area and peripheral area
3.17
design speed

maximum operable speed to be established in vehicle performance design defined by the train

manufacturer and/or operator
3.18
normal mode
window unit (3.2) or glazing unit (3.3) in an undamaged condition
3.19
degraded mode

window unit (3.2) or glazing unit (3.3) with broken external glazing material (3.4) and scratched inner

glazing material (3.4)
4 Technical and test requirements
4.1 General

Unless set out in the technical specification, the tests described in this document for a window design

to be used in additional designs of a train, or a variation of a train design, do not need to be repeated if

the following criteria are met:

— the window design has already been demonstrated to conform with the requirements of this

document;
— the window design and its mounting to the train have not changed.

The window design shall include dimensions, mounting arrangements and glass composition.

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ISO/FDIS 22752:2021(E)

If specified in the technical specification, the use of simulation to demonstrate conformance with

the following test requirements is allowed, provided that simulation process and results have been

validated against physical tests.

Table 1 sets out the relevant requirements and clauses for glazing types and window systems.

Table 1 — Requirements and clauses for glazing types and windows
Tem-
Laminated Insulating
No. Test type Requirements pered Window
glass glazing
glass
1 Static strength of window (4.2.2) M
2 Aerodynamic fatigue loading (4.2.3) M
Impact of small particles
3 O
External impact
from track (4.2.4.1)
p e r f or m a nc e
Impact of small missiles
(4.2.4)
4 O O
(4.2.4.2)
5 for laminated glass (4.2.5.2) M
Safety Shock resistance
(4.2.5)
6 for tempered glass (4.2.5.3) M
7 Fragmentation for tempered glass (4.2.6) M
8 Pendulum test (4.2.7.3) M
Internal soft body
impact resistance
Passenger containment test
9 O
(4.2.7)
(4.2.7.4, Annex D)
10 Emergency function (4.2.8) M
11 Appearance defects (4.3.1) M
Durability of the edge seal by
12 M
climatic test (4.3.2.2)
Resistance to ultraviolet
13 M
radiation test (4.3.2.3)
Quality Durability (4.3.2)
Resistance to high temper­
14 M
ature test (4.3.2.4)
Resistance to humidity test
15 M
(4.3.2.5)
16 Adhesive bonding (4.3.3) M
17 Water tightness (4.4.1) M
18 Durability test for movable window (4.4.2) M
Function
19 Optical distortion (4.4.3) M
20 Dew point (4.4.4) M
M mandatory
O optional

Depending on the type of glazing used, the individual tests are added to the test on a completed window.

In case of rubber mounting. Optional for all other cases.

It is not necessary for trains whose design speed is ≤100 km/h. It is optional for trains whose design speed is from

>100 km/h to ≤140 km/h.

The test procedure set out in Annex C is primarily undertaken for windows consisting of tempered glass on the exterior

side and laminated glass on the interior side of the vehicle.
The test should be carried out if the window is in the form of rubber mounting.

The test shall be carried out if the bodyside window is equipped with an emergency function.

For finished glazing composition.

It is not necessary if the window is sealed to the car body with adhesive bonding.

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ISO/FDIS 22752:2021(E)
4.2 Safety
4.2.1 General

There shall be no sharp edges in exposed (accessible) areas in order to avoid injury to personnel and

passengers.
4.2.2 Static strength of window
4.2.2.1 Purpose

The bodyside windows shall not be pushed out of its mounting by leaning or impact of persons. In the

case of bodyside windows, where passengers can fall out of the vehicle due to their positioning or design

(e.g. rubber mounting systems), it shall be demonstrated that these bodyside windows can withstand

the loads. Static strength test shall be applied to rubber mounting bodyside windows.

4.2.2.2 Test specimen

This test shall be conducted on the window with the largest surface area mounted on the vehicle.

The test shall be conducted on the window in its installed state representative of its mounting on the

vehicle.
4.2.2.3 Test procedure

A pressure of 5 000 Pa shall be applied uniformly on the glazing unit. The direction of the pressure

applied for this test shall be set out in the technical specification.
The pressure shall be applied for a period of 60 s.
4.2.2.4 Acceptance criteria

The window shall remain in its mounting arrangement without any disengagement during application

of the pressure.

If the window is composed of laminated glass, fractures of one or more sheets of glass is acceptable.

4.2.3 Aerodynamic fatigue loading
4.2.3.1 Purpose
The purpose of this test is to:

— demonstrate the performance of the window in service when subject to aerodynamic loads induced

by tunnels and trains passing;

— check that there is no damage to the spacer and the edge seals of the insulating glazing;

— check that there is no defect on the mounting arrangement, caused by repeated pressure loading.

4.2.3.2 Requirements
The window shall withstand alternating positive and negative pressure loads.

The test shall be undertaken subject to the technical specification or as set out in Annex A.

If the test is undertaken as set out in Annex A, the pressures, stages, including the application of the

water spray, and degraded mode (where applicable), shall be based on the vehicle's design speed.

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ISO/FDIS 22752:2021(E)

The pressures and the number of cycles defined in Annex A are intended to represent the whole design

life of the window.
4.2.3.3 Test specimen

The aerodynamic fatigue loading test shall be undertaken for the largest window. Each type of window

(fixed window, window with emergency function, movable window) shall be taken into account.

The determined test specimen(s) shall be defined in the technical specification.
4.2.3.4 Test equipment

The test equipment shall be configurable to apply the required pressure loads, signal type and

frequencies.

The test equipment shall be capable of measuring deflection of the glass and the frame during the

loading tests.

The test equipment shall be capable of spraying water during the loading tests, where applicable.

An example of the equipment that can be used is shown in Figure A.1.
4.2.3.5 Test procedure
4.2.3.5.1 Normal mode

The aerodynamic fatigue loading test shall be undertaken for the window in normal mode.

NOTE 1 Normal mode refers to the window specimen tested without any damage.
The following procedure should be followed:
— measure the dew point in accordance with 4.4.4;

— mount the test specimen in a manner which is representative of the mounting arrangement of the

window on the vehicle;

— the test equipment shall undergo a period of stabilization before commencement of the test;

— load the test specimen according to the values of the specific test stage as set out in Table A.1;

— each pulse shall start with a zero-pressure differential across the test specimen;

— there shall be no dwell period at the points of maximum and minimum relative pressure on the test

specimen;

— it is permissible for the first 200 pulses in the test sequence to deviate by up to 5 % from the specified

limit values;

— measure the deflection of the inner glazing material of the specimen at its centre when stability has

been reached at each test stage for 2 min;

— where applicable, spray the test specimen with water during the final hour of the test;

— the volume flow rate for the water spray shall be 2 l/min/m ;

NOTE 2 The water spray test is not required if the window is sealed to the car body with adhesive bonding.

— measure the dew point of the specimen at the end of the test;

— check and record any defects or failures for each layer of the glazing unit and its mounting

arrangement after the test.
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ISO/FDIS 22752:2021(E)
The test report shall include the following elements, as a minimum:
— a time history of the pressure pulses;
— a time history of the central deflection of the glazing material.
4.2.3.5.2 Degraded mode

The aerodynamic fatigue loading test may be undertaken for the window in a degraded mode.

The degraded mode test can be carried out after the normal mode test. The test for the window in the

degraded mode can be carried out as set out in the technical specification or as set out in Table A.1.

4.2.3.6 Acceptance criteria
4.2.3.6.1 Normal mode
The window shall not break at any point during and upon completion of the test.

The glazing unit or the window unit shall not disengage from its mounting at any point during and upon

completion of the test.

The maximum deflection values of the centre of the glazing are set out in Table 2.

Table 2 — Deflection
Dimensions in millimetres
Minor dimension of the glazing unit
Maximum central deflection
(length or width)
≤ 350 5
350 to 600 7
600 to 1 000 10
Minor dimension
> 1 000
+ 1
100
There shall be no water ingress if the water spray test is conducted.
The dew point of the specimen shall meet the requirements according to 4.4.4.
4.2.3.6.2 Degraded mode

There shall be no deterioration in the constituent elements of the window, with the exception of those

completed for test purposes.

With regard to the degraded elements for test purposes, the inner glazing material shall not crack or

break if it is monolithic tempered glass. If the inner pane consists of laminated glass, the propagation of

cracks is allowed but the pane shall not detach from the window.
The propagation of cracks on the outer glazing material is permitted.
No glazing material shall detach from the window unit throughout the test.
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ISO/FDIS 22752:2021(E)
4.2.4 External impact performance
4.2.4.1 Impact of small particles from track
4.2.4.1.1 Purpose

The purpose of the test defined in Annex B is to assess the anti­fracture performance of the window,

when subjected to frequent external impacts (e.g. small particles, gravel or ballast).

4.2.4.1.2 General

Bodyside windows shall withstand external impacts from projectiles, which can include ballast from

the track.

This requirement is deemed to be fulfilled by performing the prescribed test in Annex B.

4.2.4.1.3 Test procedure

If the test of external impact from track small particles is conducted, it shall be conducted on the outer

glazing material in accordance with Annex B.
4.2.4.1.4 Acceptance criteria
The acceptance criteria of tests are set out in Annex B.
4.2.4.2 Impact of small missiles
4.2.4.2.1 Purpose

The purpose of the test defined in Annex C is to assess the window's external impact performance

when subjected to external impacts from small missiles, for passenger protection. The test is intended

to represent a large projectile thrown by a strong adult.
4.2.4.2.2 General
Bodyside windows shall withstand external impacts from projectiles.

This requirement is deemed to be fulfilled by performing one of the prescribed tests from Annex C.

The test procedure set out in Annex C is primarily undertaken for windows consisting of tempered

glass on the exterior and laminated glass on the interior of the vehicle.
4.2.4.2.3 Test procedure

If the test of external impact from small missiles is conducted, it shall be conducted on a complete

window in accordance with Annex C.

Where a window is tested, the projectile shall strike the external glass surface.

4.2.4.2.4 Acceptance criteria
The acceptance criteria of tests are set out in Annex C.
4.2.4.3 Choice of tests
It is not necessary to perform both tests.
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ISO/FDIS 22752:2021(E)

The test performed in accordance with 4.2.4.1 or 4.2.4.2 should be indicated in the technical

specification.

If supported by additional justification or evidence, another test option (including another test method

or exemption of the test) can also be set out in the technical specification.
4.2.5 Shock resistance
4.2.5.1 Purpose

To demonstrate impact performance, individual sheets of glazing material shall be able to withstand

foreseeable impacts.
This gives an indication of the quality of the glazing material fabrication.
4.2.5.2 General

The proposed test is to drop a steel ball with defined mass from a defined height onto the centre of the

glazing material.

The mass for the steel ball and corresponding drop heights are set out in 4.2.5.3 and 4.2.5.4.

The shock resistance test shall be conducted on six separate test specimens.

The test specimen shall be 300 mm × 300 mm and representative of the glazing unit.

The supporting fixture should be in accordance with ISO 3537:2015, 6.2.3. Other equivalent supporting

fixtures may be used.
4.2.5.3 Test for laminated glass

The test shall be conducted at 20 °C ± 5 °C. The test specimen shall be conditioned at this temperature

for at least 4 h before testing. Subject to the technical specification, the test may be conducted over a

range of temperatures. For each selected test temperature, the test specimen shall be conditioned at

that temperature for at least 4 h before testing.
+10
A solid, smooth steel ball with a mass of 500 g g and a diameter of appro
...